Auto burglar-alarm



G. M. BRADLEY.

AUTO BURGLAR ALARM.

APPLICATIQN FILED Nov. 24. 1911.

LSQJTCZSG. Patented Jan. 6,1920,

i UNITED sra'rn GEORGE IVI. BRADLEY, OF LANSING, MICHIGAN.

.AUTO BURGLAR-ALARM.

Specification of Letters Patent.

Yirpplication ledNovember 24, 1917. lSerial No. 203,710. Y

To all whom t may concern Be itlrnown that l, GEORGE M. BRADLEY, a citizen of the United States, residing vat Lansing, in the county of ngham and State of lVlichiga-n, have invented new and useful Improvements in Auto Burglar-Alarms, of which the following isa specification.

This invention relates to an auto burglar or thief alarm adapted particularly for use upon automobiles, for sounding an alarm when an attempt is made by an unauthorized person tostart the engine of the automobile and drive o the vehicle.

The primary object of the invention is to provide lan alarm whistle which may be connected with the engine in such a manner that when the engine is started into action an alarm will be sounded.

A further object of the invention is to provide an alarm whistle which may 'beconnected with one of the` engine cylinders so that upon the movement of the piston therein a portion of the explosive charge or, exhaust from the engine cylinder will be forced out through the lwhistle', thereby sounding the alarm.

A further' object of the invention is to provide an alarm device of the character described which is adapted to be controlled by' a lock or similar device and set and lockedV in operative position for action when the owner leaves the vehicle standing, so as to be operated if the engine is started during the absence of thel owner.

The invention consistsof the. features `of construction, combination and arrangement of parts, ,hereinafter 4fully described and claimed, reference being had to the accompanying drawing, in which Figure 1 is a view showing aportion of an automobile and illustrating the application of the invention.

Fig. 2 is a vertical longitudinal section through the whistle and adjacent end of the controlling shaft.

Fig. 3 is a vertical section taken on the line 38 of Fig. 2.

Fig. 4 is a sectional view through the dash board of the vehicle and the adjacent end of the controlling shaft and its casing.

In carrying my invention into practice, I` provide an alarm device 1 comprisinga bowl 2 from which rises a sound tube 3 provided with suitable perforations 4 for the escape of the air or sounding fluid. Disposed between the top of the bowl and the base o f the Vsound tube 3 isa perforated horizontal partition or diaphragm 5, and extending upwardly from said partition .to theftopv ofthe sound tube 3 is an imperforate vertical partition 6 separatingusaid sound tube Yintotsounding chambers or compartments 7 and 8. The fluid Vunder pressure entering the bowl passes upwardly through 4the perforated diaphragm 5 and enters the sound chambers f7 and 8 ofthe sound tube-3 and escapes through the sound outlets thereof, thus Asounding the whistle. Disposed within the chamber 8 is ahorizontal partition 9 operating `as abaffle to control theflow ofthe sounding'uid to vary the sound produced bythe whistle chamber 8 with respect to that` produced by the whistlevchamber 7, v whereby a distinctive sound of'a certain character is produced. i f

Thebowll 2 is threaded-or otherwise `secured at its-lower end .in the outletof a valve or Acoclr'l() whichlis provided at its lower Vor inletend with a stem 11v projecting-downwardly through theJ base or Vbottom wall 12'of a'guard casing or shell-18 inclosing the cock and parts of the whistle, said shellbeing provided withv perforationsf14 foithe 'escape of the s ound` to `the atmosphere and acting as a' protecting medium to guard the whistle from injury and to prevent the same Afrom being damaged-,ordestroyed by malicious parties.L The stemv 11 is connected by a coupling 15 to the upper;

end of aconductingpipe 16, which conducting,pipeflsisithreaded at its lower. end

into the threaded @pertinent a-,Cylnderof the engine or motor `17 within which the priming cock is usually fitted, thus establishing communication between the whistle and a cylinder of the engine for the flow of the fluid mixture or products of combustion to the whistle to-sound the whistle, under certain conditions, when the engine or motor is in action. 1n practice, the alarm whistle is applied to the engine by simply removing one of the priming cocks and substituting the whistle in its place.

The valve member of the cockp10 is provided with an eXteriorly projecting stem 18 .to which is secured a gear segment 19. This segment 19 meshes with a gear 20 upon the adjacent end of a controlling or actuating shaft 21. The shaft 21 extends from the shell or casing 14 to the dash board 22 of the automobile, and said shaft is preferably in- Patented J an.,6, 1920.'

tecting pipe or casing 23, whereby damage Y to the shaft or interference therewith in an attempt to prevent the operation of the alarm will be prevented. The rear end of the shaft terminates in an angular projection 24 which fits within a rotary socket 25 forming part of the locking mechanism of a lock device 26 mounted upon the dash board 22, which lock device 26 may be of the Yale type'. When this lock device is turned in one direction to a locked position it'will rotate the shaft 2l in the proper direction to actuate the gear 19 so as to open thel valve or cock 10 to establish communication between the engine cylinder and whistle, to render the whistle operative, and the shaft and cock will be locked in such position as long as the locking mechanism of the lock 26 remains in vlocking position. When, on the other hand, the locking mechanism of the lock 26 is turned in the opposite direction to unlocking position, the shaft 21 will be rotated in the opposite direction to close the valveor cock l0 and thus cut off communication between the engine cylinder and whistle, thus rendering the whistle inoperative, which is its normal condition in the ordinary runing or operation of the vehicle.

It will thus be understood that the lock is normally maintained in unlocked position and the valve in closed position until such a time as the owner of the automobile desires to set the whistle for operation. Thismay be when he wishes to park or leave his machine standing for any length of time, in order that the alarm mechanism may be set to sound an alarm when any unauthorized person starts the engine and attempts to make off with the vehicle. To set the alarm, the operator simply turns the lock to locked position by means of a proper key, which is then removedfrom the lock, whereby the valve or cock 10 will be moved to open position and locked in such position. Communication between an engine cylinder and the taken to prevent the theft of the machine as y will be readily understood. It will be seen from the foregoing description that the alarm device provided for the purpose described is simple of construction and may be manufactured andinstalled at a comparatively low cost, and that when set for action it will give an alarm as soon as the engine is started, and that as the alarm is locked in operative position the engine can not be started without an alarm being given and the alarm can not be thrown out of action except by one familiar with the actuation of the controlling shaft and possessed of the proper type of key.

Having thus fully described my invention,

I claim:

In an alarm device for automobiles, the combination of a dashboard, a motor, an alarm device adapted to be operated by eX- pulsion of fluid products from the motor, an

actua-ting element fitted in the dashboard, a perforated guard casing inclosing the alarm device, a valve inclosed within the guard casing and controlling communication between the alarm device and motor, gearing inclosed within ythe guard casing for opening and closing the valve, a rod or shaft eX- tending between and connecting said gearing with said actuating element, and a guard tube extending between and connecting the perforated guard casing with the dashboard and inclosing the rod or shaft between the" actuating element and the gearing.

In testimony whereof I aiiiX my signature. GEORGE M. BRADLEY. 

